Embedded magnet type motor

a technology of embedded magnets and motors, which is applied in the direction of magnetic circuits, electrical devices, dynamo-electric machines, etc., can solve the problems of reducing excessive leakage fluxes passing through the outer bridges, and increasing the number of parts, so as to reduce the effective flux of embedded magnet motors, increase torque, and prevent an increase in the number of parts

Inactive Publication Date: 2009-05-07
ASMO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]An objective of the present invention is to provide an embedded magnet type motor which increases the torque while preventing an increase in the number of parts and reducing leakage fluxes.

Problems solved by technology

However, when two magnets are provided per one magnetic pole, the number of parts increases and parts management cost and assembly cost also increase.
Therefore, leakage fluxes passing through the outer bridges are excessive as a whole of the motor.
This reduces the effective fluxes of the embedded magnet type motor and obstructs the torque increase.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0027]Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1A through FIG. 3. As shown in FIG. 1A, an embedded magnet type motor includes a stator 1 and a rotor 2.

[0028]The stator 1 is cylindrical as a whole. The stator 1 includes a stator core 5 and a plurality of coils 6. The stator core 5 has a cylindrical portion 3 forming an outer shape and a plurality of teeth 4 arranged at equiangular intervals in the circumferential direction on the inner peripheral surface of the cylindrical portion 3. Each of these teeth extends toward the axial line L of the stator 1 from the inner peripheral surface of the cylindrical portion 3, that is, toward the radially inner side of the cylindrical portion 3. Each of the coils 6 is concentrically wound around a corresponding tooth 4 with an insulator (not shown). In FIG. 1A, one coil 6 is shown by an alternate long and short double-dashed line. The stator core 5 of this embodiment includes twelve teeth 4. As s...

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Abstract

A rotor of an embedded magnet type motor is disclosed. A rotor core of the motor includes first accommodation holes and V-shaped accommodation holes The first accommodation holes extend in radial directions, and the V-shaped accommodation holes protrude radially outward. The rotor core has grooves at positions corresponding to the first accommodation holes on the outer periphery of the rotor core. Each groove has a width as a dimension in the circumferential direction when viewed from the axial direction. Each first magnet has a width as a dimension in the circumferential direction when viewed from the axial direction. The width of the grooves is larger than the width of the first magnets.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to an embedded magnet type motor.[0002]Conventionally, a rotor core of an embedded magnet type motor has a plurality of accommodation holes aligned in the circumferential direction, and the accommodation holes perforate through the rotor core axially. In the accommodation holes, magnets are accommodated.[0003]In the embedded magnet type motor disclosed in Japanese Laid-Open Patent Publication No. 2005-51982, each of a plurality of magnetic poles includes a pair of magnets arranged in a V shape to protrude radially inward. Specifically, when the number of magnetic poles of the embedded magnet type motor is P, the number of magnets is 2 P. With this construction, a higher torque can be realized in comparison with a motor in which one magnet is provided per one magnetic pole.[0004]However, when two magnets are provided per one magnetic pole, the number of parts increases and parts management cost and assembly cost also incr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02K21/14
CPCH02K1/2766
Inventor NAKAYAMA, TAKAHIROTAKABE, YOSHIYUKIITOH, HIROTAKA
Owner ASMO CO LTD
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